What Lego set has the most/best play features?

What Lego set has the most/best play features? I was looking at the Spider-man Web Warriors Ultimate Bridge Battle set and I loved all the play features it has, so now I am planning on buying that set next. I want a play set to play with my younger brother. I also prefer the play sets over just builds if you know what I mean by that.

As a parent, the sets my kids play with the most are the Friends fairground sets. As a family we own hundreds of sets but the roller coaster specifically has provided hours of play. We ended up buying the whole theme which we set up on a dedicated table in the house where it's been for 4 months - and played with pretty much every day. It has to be our favourite set ever.

From an AFOL viewpoint, who doesn't like to swoosh a quinjet (the original one) once in a while?

I appreciate clever mechanisms like the door opening system in Ragana's Magic Shadow Castle. Much more interesting than flick-fire missiles or super jumper gimmicks. To be fair though, my son likes shooting features so they do have a place.

#70595 Ultra Stealth Raider is a contender. Maybe not quite as feature-heavy as the Fortrex, but it has a transforming bike with two six-shooters and a spare ammo compartment, two tread bikes with spring missiles, and a jet with pop-out wings/blades, all of which combine into a futuristic tank. The set includes minifigures of four ninja, but the vehicle can seat all six. It also includes a "Chenosaurus" with two spring shooters.

#70596 and #70323 are also very playable, though more expensive than the Fortrex or USR. Jestro's lair is noteworthy in that it has a lot of intense action features typical of boy-oriented themes, but also some dollhouse-style livable spaces of the sort you rarely see outside girl-oriented themes like Friends or Elves. In addition to the traps, dungeon, turrets, flying throne, and giant hellmouth, Jestro gets his own bed, bathtub, and kitchen! It's all suitably spooky for a villain lair, but also sort of cute and humorous.

Some of my som's favorites over the years... Silver Mine from The Lone Ranger, Police Station, (the version they did the mega factories tv show on), a number of the Ninjago sets, including lighthouse siege, scooby-do mansion, etc.

I believe the Prison Island Police Station set is still out. My son really does not care for city, but this was a set he bought with his own money. It had a number of features to it. How did he know? YouTube video reviews. Jangbricks has some nice family friendly videos, and is our main source. That is a nice way to check out the features of these sets.

I actually picked up on a sale around Christmas a number of the sets mentioned here, because I felt they were ones he would like for their features. The Spider-Man bridge, fortrex, and the lava lair. I have these all stashed, though, so no idea if he really likes them or not.